CVE-2026-8420— BLOGCHAT Chat System <= 1.3.6.3 - Cross-Site Request Forgery to Stored Cross-Site Scripting via Settings Update
Possible ATT&CK Techniques 1AI
T1505.003 · Web ShellAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| rdbeach | BLOGCHAT Chat System | ≤ 1.3.6.3 | affected |
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I. Basic Information for CVE-2026-8420
Vulnerability Information
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Vulnerability Title
BLOGCHAT Chat System <= 1.3.6.3 - Cross-Site Request Forgery to Stored Cross-Site Scripting via Settings Update
Source: NVD (National Vulnerability Database)
Vulnerability Description
The BLOGCHAT Chat System plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 1.3.6.3. This is due to missing or incorrect nonce validation on a function. This makes it possible for unauthenticated attackers to update settings and inject malicious web scripts via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
跨站请求伪造(CSRF)
Source: NVD (National Vulnerability Database)
Vulnerability Title
WordPress plugin BLOGCHAT Chat System 跨站请求伪造漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress和WordPress plugin都是WordPress基金会的产品。WordPress是一套使用PHP语言开发的博客平台。该平台具有在基于PHP和MySQL的服务器上架设个人博客网站的功能。WordPress plugin是一个应用插件。 WordPress plugin BLOGCHAT Chat System 1.3.6.3及之前版本存在跨站请求伪造漏洞，该漏洞源于函数缺少或错误nonce验证，可能导致未经验证的攻击者通过伪造请求更新设置并注入恶意Web脚本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| rdbeach | BLOGCHAT Chat System | 0 ~ 1.3.6.3 | - |
II. Public POCs for CVE-2026-8420
| # | POC Description | Source Link | Shenlong Link |
|---|
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IV. Related Vulnerabilities
Same weakness: CWE-352
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JupyterHub: Cross-origin form POSTs bypass XSRF - CVE-2026-8340
Concrete CMS 9.5.0 and below is vulnerable to CSRF via Backe - CVE-2026-7615
Widget Context <= 1.3.3 - Cross-Site Request Forgery to Sett - CVE-2026-4070
Alfie <= 1.2.1 - Cross-Site Request Forgery to Feed Deletion - CVE-2026-8409
Concrete CMS 9 before 9.5.0 is vulnerable to Cross Site Requ
V. Comments for CVE-2026-8420
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